The Effect of cAMP on Phosphohydrolase Activity of the Barley Root Cells

The Effect of cAMP on Phosphohydrolase Activity of the Barley Root Cells We studied the effects of cAMP on phosphohydrolase activity in the microsomal fraction and its 0.5 M KCl extract. In both preparations, cAMP inhibited the activity of acid phosphatases. In the microsomal fraction, a 50% inhibition of acid cation-dependent (Mg2+, Cu2+) phosphatase was induced at pH 6.0 by 10 μM cAMP; whereas, for cation-independent phosphatase, this effect was exerted only by 50 μM cAMP. In the KCl extract, the sensitivity of both cation-dependent and cation-independent acid phosphatases to cAMP was higher than in the microsomal fraction. Cyclic AMP did not reduce the activity of nucleosidases. Selectivity in the cAMP action on acid phosphatases is assumed to be one of the mechanisms controlling the biochemical activity outside the barley root cells. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

The Effect of cAMP on Phosphohydrolase Activity of the Barley Root Cells

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Publisher
Springer Journals
Copyright
Copyright © 2002 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/A:1015532716771
Publisher site
See Article on Publisher Site

Abstract

We studied the effects of cAMP on phosphohydrolase activity in the microsomal fraction and its 0.5 M KCl extract. In both preparations, cAMP inhibited the activity of acid phosphatases. In the microsomal fraction, a 50% inhibition of acid cation-dependent (Mg2+, Cu2+) phosphatase was induced at pH 6.0 by 10 μM cAMP; whereas, for cation-independent phosphatase, this effect was exerted only by 50 μM cAMP. In the KCl extract, the sensitivity of both cation-dependent and cation-independent acid phosphatases to cAMP was higher than in the microsomal fraction. Cyclic AMP did not reduce the activity of nucleosidases. Selectivity in the cAMP action on acid phosphatases is assumed to be one of the mechanisms controlling the biochemical activity outside the barley root cells.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 13, 2004

References

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